> If the plans for both queries are exactly the same, should I assume
> that the cost will also be the same?

Nope.   A seq scan over 1,000,000,000 rows is going to cost a LOT more than a 
seq scan over 1000 rows, even though it's the same plan.

When you have the data sorted out, post explain analyzes and we'll take a shot 
at it.

Josh Berkus
Aglio Database Solutions
San Francisco

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TIP 9: the planner will ignore your desire to choose an index scan if your
      joining column's datatypes do not match

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